# CVE-2021-43666: mbedtls: A Denial of Service vulnerability exists in mbed TLS 3.0.0 and earlier in the mbedtls_pkcs12_derivation function when...

CVE-2021-43666 is fixed in mbedtls on 1 platform, first by DEBIAN-CVE-2021-43666, released March 24, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-43666
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0207
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 24, 2022

## Description

A Denial of Service vulnerability exists in mbed TLS 3.0.0 and earlier in the mbedtls_pkcs12_derivation function when an input password's length is 0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | mbedtls Debian 12.15 (bookworm) | 2.28.0-1 | [DEBIAN-CVE-2021-43666](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43666.md) | Mar 24, 2022 |
| Linux | mbedtls Debian 13.5 (trixie) | 2.28.0-1 | [DEBIAN-CVE-2021-43666](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43666.md) | Mar 24, 2022 |
| Linux | mbedtls Debian 14 | 2.28.0-1 | [DEBIAN-CVE-2021-43666](https://patchblox.com/security/data/fix/linux/debian-cve-2021-43666.md) | Mar 24, 2022 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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